Standard Lemma guide

fissionable

adj · noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • CMU ARPABET: F IH1 SH AH0 N AH0 B AH0 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Capable of undergoing nuclear fission; fissile.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Any fissile or fissionable substance.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adjective

Meaning 3

capable of undergoing nuclear fission

Definition source: Princeton WordNet 3.0

Examples

  • a fissionable nucleous
  • fissionable material

Meaning relationships

Synonyms: fissile

Antonyms: nonfissionable

History

Etymology

Etymology tree English fission Proto-Indo-European *-tḗr Proto-Indo-European *-dhlom Proto-Indo-European *-dhlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English fissionable From fission + -able.

Across languages

Translations

3 source translations are retained for this English entry.

  • German: spaltbar — capable of undergoing nuclear fission; fissile
  • Romanian: fisionabil — capable of undergoing nuclear fission; fissile
  • Tagalog: sipakin — capable of undergoing nuclear fission; fissile